$4+42+49-6$
$\lim_{x\to\infty}\left(\left(\frac{5x-2}{5x+3}\right)^{5x+1}\right)$
$\left(mx+n\right)\left(px+q\right)$
$\left(4x^4-y^4\right)^2$
$\int4cos\left(1-x\right)dx$
$3x+2y=-6$
$\left(2a^2+3a^4+7a^3\right)-\left(8a^3-2a^4-a^2\right)$
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